// Copyright 2011 David Galles, University of San Francisco. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification, are
// permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this list of
// conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
// of conditions and the following disclaimer in the documentation and/or other materials
// provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY <COPYRIGHT HOLDER> ``AS IS'' AND ANY EXPRESS OR IMPLIED
// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
// FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> OR
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
// ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// The views and conclusions contained in the software and documentation are those of the
// authors and should not be interpreted as representing official policies, either expressed
// or implied, of the University of San Francisco
import { Algorithm, addControlToAlgorithmBar } from "@/components/algorithm/Algorithm";

export class ComparisonSort extends Algorithm{
    constructor(am, w, h) {
        super();
        this.init(am, w, h);

    }
    init(am, w, h) {
        super.init.call(this, am);
        this.addControls();
        this.nextIndex = 0;

        this.setArraySize(true);
        this.arrayData = new Array(ARRAY_SIZE_LARGE);
        this.arraySwap = new Array(ARRAY_SIZE_LARGE);
        this.labelsSwap = new Array(ARRAY_SIZE_LARGE);
        this.objectsSwap = new Array(ARRAY_SIZE_LARGE);

        this.createVisualObjects();
    }
    addControls() {
        this.resetButton = addControlToAlgorithmBar("Button", "随机数组");
        this.resetButton.onclick = this.resetCallback.bind(this);

        this.insertSortButton = addControlToAlgorithmBar("Button", "插入排序");
        this.insertSortButton.onclick = this.insertSortCallback.bind(this);

        this.selectSortButton = addControlToAlgorithmBar("Button", "选择排序");
        this.selectSortButton.onclick = this.selectSortCallback.bind(this);

        this.bubbleSortButton = addControlToAlgorithmBar("Button", "冒泡排序");
        this.bubbleSortButton.onclick = this.bubbleSortCallback.bind(this);

        this.quickSortButton = addControlToAlgorithmBar("Button", "快速排序");
        this.quickSortButton.onclick = this.quickSortCallback.bind(this);

        this.mergeSortButton = addControlToAlgorithmBar("Button", "并归排序");
        this.mergeSortButton.onclick = this.mergeSortCallback.bind(this);

        this.shellSortButton = addControlToAlgorithmBar("Button", "希尔排序");
        this.shellSortButton.onclick = this.shellSortCallback.bind(this);

        this.sizeButton = addControlToAlgorithmBar("Button", "改变大小");
        this.sizeButton.onclick = this.changeSizeCallback.bind(this);
    }
    setArraySize(small) {
        if (small) {
            this.array_size = ARRAY_SIZE_SMALL;
            this.array_width = ARRAY_WIDTH_SMALL;
            this.array_bar_width = ARRAY_BAR_WIDTH_SMALL;
            this.array_initial_x = ARRAY_INITIAL_X_SMALL;
            this.array_y_pos = ARRAY_Y_POS;
            this.array_label_y_pos = ARRAY_LABEL_Y_POS;
            this.showLabels = true;
        }

        else {
            this.array_size = ARRAY_SIZE_LARGE;
            this.array_width = ARRAY_WIDTH_LARGE;
            this.array_bar_width = ARRAY_BAR_WIDTH_LARGE;
            this.array_initial_x = ARRAY_INITIAL_X_LARGE;
            this.array_y_pos = ARRAY_Y_POS;
            this.array_label_y_pos = ARRAY_LABEL_Y_POS;
            this.showLabels = false;
        }

    }
    resetAll(small) {
        this.animationManager.resetAll();
        this.setArraySize(!small);
        this.nextIndex = 0;
        this.createVisualObjects();
    }
    randomizeArray() {
        this.commands = new Array();
        for (var i = 0; i < this.array_size; i++) {
            this.arrayData[i] = Math.floor(1 + Math.random() * 99);
            this.oldData[i] = this.arrayData[i];
            if (this.showLabels) {
                this.cmd("SetText", this.barLabels[i], this.arrayData[i]);
            }

            else {
                this.cmd("SetText", this.barLabels[i], "");
            }
            this.cmd("SetHeight", this.barObjects[i], this.arrayData[i] * SCALE_FACTOR);
        }
        this.animationManager.StartNewAnimation(this.commands);
        this.animationManager.skipForward();
        this.animationManager.clearHistory();

    }
    swap(index1, index2) {
        var tmp = this.arrayData[index1];
        this.arrayData[index1] = this.arrayData[index2];
        this.arrayData[index2] = tmp;

        tmp = this.barObjects[index1];
        this.barObjects[index1] = this.barObjects[index2];
        this.barObjects[index2] = tmp;

        tmp = this.barLabels[index1];
        this.barLabels[index1] = this.barLabels[index2];
        this.barLabels[index2] = tmp;


        this.cmd("Move", this.barObjects[index1], this.barPositionsX[index1], this.array_y_pos);
        this.cmd("Move", this.barObjects[index2], this.barPositionsX[index2], this.array_y_pos);
        this.cmd("Move", this.barLabels[index1], this.barPositionsX[index1], this.array_label_y_pos);
        this.cmd("Move", this.barLabels[index2], this.barPositionsX[index2], this.array_label_y_pos);
        this.cmd("Step");
    }
    createVisualObjects() {
        this.barObjects = new Array(this.array_size);
        this.oldBarObjects = new Array(this.array_size);
        this.oldbarLabels = new Array(this.array_size);

        this.barLabels = new Array(this.array_size);
        this.barPositionsX = new Array(this.array_size);
        this.oldData = new Array(this.array_size);
        this.obscureObject = new Array(this.array_size);


        var xPos = this.array_initial_x;
        var yPos = this.array_y_pos;
        var yLabelPos = this.array_label_y_pos;

        this.commands = new Array();
        for (var i = 0; i < this.array_size; i++) {
            xPos = xPos + this.array_width;
            this.barPositionsX[i] = xPos;
            this.cmd("CreateRectangle", this.nextIndex, "", this.array_bar_width, 200, xPos, yPos, "center", "bottom");
            this.cmd("SetForegroundColor", this.nextIndex, BAR_FOREGROUND_COLOR);
            this.cmd("SetBackgroundColor", this.nextIndex, BAR_BACKGROUND_COLOR);
            this.barObjects[i] = this.nextIndex;
            this.oldBarObjects[i] = this.barObjects[i];
            this.nextIndex += 1;
            if (this.showLabels) {
                this.cmd("CreateLabel", this.nextIndex, "99", xPos, yLabelPos);
            }

            else {
                this.cmd("CreateLabel", this.nextIndex, "", xPos, yLabelPos);
            }
            this.cmd("SetForegroundColor", this.nextIndex, INDEX_COLOR);

            this.barLabels[i] = this.nextIndex;
            this.oldbarLabels[i] = this.barLabels[i];
            ++this.nextIndex;
        }
        this.animationManager.StartNewAnimation(this.commands);
        this.animationManager.skipForward();
        this.randomizeArray();
        for (i = 0; i < this.array_size; i++) {
            this.obscureObject[i] = false;
        }
        this.lastCreatedIndex = this.nextIndex;
    }
    highlightRange(lowIndex, highIndex) {
        for (var i = 0; i < lowIndex; i++) {
            if (!this.obscureObject[i]) {
                this.obscureObject[i] = true;
                this.cmd("SetAlpha", this.barObjects[i], 0.08);
                this.cmd("SetAlpha", this.barLabels[i], 0.08);
            }
        }
        for (i = lowIndex; i <= highIndex; i++) {
            if (this.obscureObject[i]) {
                this.obscureObject[i] = false;
                this.cmd("SetAlpha", this.barObjects[i], 1.0);
                this.cmd("SetAlpha", this.barLabels[i], 1.0);
            }
        }
        for (i = highIndex + 1; i < this.array_size; i++) {
            if (!this.obscureObject[i]) {
                this.obscureObject[i] = true;
                this.cmd("SetAlpha", this.barObjects[i], 0.08);
                this.cmd("SetAlpha", this.barLabels[i], 0.08);
            }
        }
    }
    reset() {
        for (var i = 0; i < this.array_size; i++) {

            this.arrayData[i] = this.oldData[i];
            this.barObjects[i] = this.oldBarObjects[i];
            this.barLabels[i] = this.oldbarLabels[i];
            if (this.showLabels) {
                this.cmd("SetText", this.barLabels[i], this.arrayData[i]);
            }

            else {
                this.cmd("SetText", this.barLabels[i], "");
            }
            this.cmd("SetHeight", this.barObjects[i], this.arrayData[i] * SCALE_FACTOR);
        }
        this.commands = new Array();
    }
    resetCallback(event) {
        this.randomizeArray();
    }
    changeSizeCallback(event) {
        this.resetAll(this.showLabels);
    }
    insertSortCallback(event) {
        this.animationManager.clearHistory();
        this.commands = new Array();
        this.insertionSortSkip(1, 0);
        this.animationManager.StartNewAnimation(this.commands);
        this.commands = new Array();
    }
    selectSortCallback(event) {
        this.commands = new Array();
        this.animationManager.clearHistory();


        for (var i = 0; i < this.array_size - 1; i++) {
            var smallestIndex = i;
            this.cmd("SetForegroundColor", this.barObjects[smallestIndex], HIGHLIGHT_BAR_COLOR);
            this.cmd("SetBackgroundColor", this.barObjects[smallestIndex], HIGHLIGHT_BAR_BACKGROUND_COLOR);
            for (var j = i + 1; j < this.array_size; j++) {
                this.cmd("SetForegroundColor", this.barObjects[j], HIGHLIGHT_BAR_COLOR);
                this.cmd("SetBackgroundColor", this.barObjects[j], HIGHLIGHT_BAR_BACKGROUND_COLOR);
                this.cmd("Step");
                if (this.arrayData[j] < this.arrayData[smallestIndex]) {
                    this.cmd("SetForegroundColor", this.barObjects[smallestIndex], BAR_FOREGROUND_COLOR);
                    this.cmd("SetBackgroundColor", this.barObjects[smallestIndex], BAR_BACKGROUND_COLOR);
                    smallestIndex = j;
                }

                else {
                    this.cmd("SetForegroundColor", this.barObjects[j], BAR_FOREGROUND_COLOR);
                    this.cmd("SetBackgroundColor", this.barObjects[j], BAR_BACKGROUND_COLOR);
                }
            }
            if (smallestIndex != i) {
                this.swap(smallestIndex, i);
            }
            this.cmd("SetForegroundColor", this.barObjects[i], BAR_FOREGROUND_COLOR);
            this.cmd("SetBackgroundColor", this.barObjects[i], BAR_BACKGROUND_COLOR);
        }
        this.animationManager.StartNewAnimation(this.commands);
    }
    bubbleSortCallback(event) {
        this.animationManager.clearHistory();

        this.commands = new Array();
        for (var i = this.array_size - 1; i > 0; i--) {
            for (var j = 0; j < i; j++) {
                this.cmd("SetForegroundColor", this.barObjects[j], HIGHLIGHT_BAR_COLOR);
                this.cmd("SetBackgroundColor", this.barObjects[j], HIGHLIGHT_BAR_BACKGROUND_COLOR);

                this.cmd("SetForegroundColor", this.barObjects[j + 1], HIGHLIGHT_BAR_COLOR);
                this.cmd("SetBackgroundColor", this.barObjects[j + 1], HIGHLIGHT_BAR_BACKGROUND_COLOR);
                this.cmd("Step");
                if (this.arrayData[j] > this.arrayData[j + 1]) {
                    this.swap(j, j + 1);
                }
                this.cmd("SetForegroundColor", this.barObjects[j], BAR_FOREGROUND_COLOR);
                this.cmd("SetBackgroundColor", this.barObjects[j], BAR_BACKGROUND_COLOR);

                this.cmd("SetForegroundColor", this.barObjects[j + 1], BAR_FOREGROUND_COLOR);
                this.cmd("SetBackgroundColor", this.barObjects[j + 1], BAR_BACKGROUND_COLOR);

            }
        }
        this.animationManager.StartNewAnimation(this.commands);
    }
    quickSortCallback(event) {
        this.animationManager.clearHistory();

        this.commands = new Array();
        this.iID = this.nextIndex++;
        this.jID = this.nextIndex++;
        this.cmd("CreateLabel", this.iID, "i", this.barObjects[0], this.array_label_y_pos + 20);
        this.cmd("CreateLabel", this.jID, "j", this.barObjects[this.array_size - 1], this.array_label_y_pos + 20);
        this.cmd("SetForegroundColor", this.iID, HIGHLIGHT_BAR_COLOR);
        this.cmd("SetBackgroundColor", this.iID, HIGHLIGHT_BAR_BACKGROUND_COLOR);
        this.cmd("SetForegroundColor", this.jID, HIGHLIGHT_BAR_COLOR);
        this.cmd("SetBackgroundColor", this.jID, HIGHLIGHT_BAR_BACKGROUND_COLOR);
        this.doQuickSort(0, this.array_size - 1);
        this.cmd("Delete", this.iID);
        this.cmd("Delete", this.jID);
        this.animationManager.StartNewAnimation(this.commands);
    }
    doQuickSort(low, high) {
        this.highlightRange(low, high);
        if (high <= low)
            return;
        this.cmd("Step");
        var lineID = this.nextIndex;
        var pivot = this.arrayData[low];
        this.cmd("CreateRectangle", lineID, "", (this.array_size + 1) * this.array_width, 0, this.array_initial_x, this.array_y_pos - pivot * 2, "left", "bottom");
        this.cmd("SetForegroundColor", lineID, QUICKSORT_LINE_COLOR);
        var i = low + 1;
        var j = high;

        this.cmd("Move", this.iID, this.barPositionsX[i], this.array_label_y_pos + 20);
        this.cmd("Move", this.jID, this.barPositionsX[j], this.array_label_y_pos + 20);
        this.cmd("Step");

        while (i <= j) {

            this.cmd("SetForegroundColor", this.barObjects[i], HIGHLIGHT_BAR_COLOR);
            this.cmd("SetBackgroundColor", this.barObjects[i], HIGHLIGHT_BAR_BACKGROUND_COLOR);
            this.cmd("SetForegroundColor", this.barObjects[low], HIGHLIGHT_BAR_COLOR);
            this.cmd("SetBackgroundColor", this.barObjects[low], HIGHLIGHT_BAR_BACKGROUND_COLOR);
            this.cmd("Step");
            this.cmd("SetForegroundColor", this.barObjects[low], BAR_FOREGROUND_COLOR);
            this.cmd("SetBackgroundColor", this.barObjects[low], BAR_BACKGROUND_COLOR);

            this.cmd("SetForegroundColor", this.barObjects[i], BAR_FOREGROUND_COLOR);
            this.cmd("SetBackgroundColor", this.barObjects[i], BAR_BACKGROUND_COLOR);
            while (i <= j && this.arrayData[i] < pivot) {
                ++i;
                this.cmd("Move", this.iID, this.barPositionsX[i], this.array_label_y_pos + 20);
                this.cmd("Step");
                this.cmd("SetForegroundColor", this.barObjects[low], HIGHLIGHT_BAR_COLOR);
                this.cmd("SetBackgroundColor", this.barObjects[low], HIGHLIGHT_BAR_BACKGROUND_COLOR);
                this.cmd("SetForegroundColor", this.barObjects[i], HIGHLIGHT_BAR_COLOR);
                this.cmd("SetBackgroundColor", this.barObjects[i], HIGHLIGHT_BAR_BACKGROUND_COLOR);
                this.cmd("Step");
                this.cmd("SetForegroundColor", this.barObjects[low], BAR_FOREGROUND_COLOR);
                this.cmd("SetBackgroundColor", this.barObjects[low], BAR_BACKGROUND_COLOR);

                this.cmd("SetForegroundColor", this.barObjects[i], BAR_FOREGROUND_COLOR);
                this.cmd("SetBackgroundColor", this.barObjects[i], BAR_BACKGROUND_COLOR);
            }
            this.cmd("SetForegroundColor", this.barObjects[j], HIGHLIGHT_BAR_COLOR);
            this.cmd("SetBackgroundColor", this.barObjects[j], HIGHLIGHT_BAR_BACKGROUND_COLOR);

            this.cmd("SetForegroundColor", this.barObjects[low], HIGHLIGHT_BAR_COLOR);
            this.cmd("SetBackgroundColor", this.barObjects[low], HIGHLIGHT_BAR_BACKGROUND_COLOR);

            this.cmd("Step");
            this.cmd("SetForegroundColor", this.barObjects[j], BAR_FOREGROUND_COLOR);
            this.cmd("SetBackgroundColor", this.barObjects[j], BAR_BACKGROUND_COLOR);

            this.cmd("SetForegroundColor", this.barObjects[low], BAR_FOREGROUND_COLOR);
            this.cmd("SetBackgroundColor", this.barObjects[low], BAR_BACKGROUND_COLOR);

            while (j >= i && this.arrayData[j] > pivot) {
                --j;
                this.cmd("Move", this.jID, this.barPositionsX[j], this.array_label_y_pos + 20);
                this.cmd("Step");
                this.cmd("SetForegroundColor", this.barObjects[j], HIGHLIGHT_BAR_COLOR);
                this.cmd("SetBackgroundColor", this.barObjects[j], HIGHLIGHT_BAR_BACKGROUND_COLOR);

                this.cmd("SetForegroundColor", this.barObjects[low], HIGHLIGHT_BAR_COLOR);
                this.cmd("SetBackgroundColor", this.barObjects[low], HIGHLIGHT_BAR_BACKGROUND_COLOR);

                this.cmd("Step");
                this.cmd("SetForegroundColor", this.barObjects[j], BAR_FOREGROUND_COLOR);
                this.cmd("SetBackgroundColor", this.barObjects[j], BAR_BACKGROUND_COLOR);
                this.cmd("SetForegroundColor", this.barObjects[low], BAR_FOREGROUND_COLOR);
                this.cmd("SetBackgroundColor", this.barObjects[low], BAR_BACKGROUND_COLOR);
            }
            if (i <= j) {
                this.cmd("Move", this.jID, this.barPositionsX[j - 1], this.array_label_y_pos + 20);
                this.cmd("Move", this.iID, this.barPositionsX[i + 1], this.array_label_y_pos + 20);

                this.swap(i, j);
                ++i;
                --j;
            }
        }
        if (i >= low) {
            this.cmd("SetForegroundColor", this.barObjects[i], BAR_FOREGROUND_COLOR);
            this.cmd("SetBackgroundColor", this.barObjects[i], BAR_BACKGROUND_COLOR);

        }
        if (j <= high) {
            this.cmd("SetForegroundColor", this.barObjects[j], BAR_FOREGROUND_COLOR);
            this.cmd("SetBackgroundColor", this.barObjects[j], BAR_BACKGROUND_COLOR);

        }
        this.swap(low, j);

        this.cmd("Step");
        this.cmd("Delete", lineID);

        this.doQuickSort(low, j - 1);
        this.doQuickSort(j + 1, high);
        this.highlightRange(low, high);
    }
    mergeSortCallback(event) {
        this.animationManager.clearHistory();

        this.commands = new Array();
        this.doMergeSort(0, this.array_size - 1);
        this.animationManager.StartNewAnimation(this.commands);
    }
    doMergeSort(low, high) {
        this.highlightRange(low, high);
        if (low < high) {
            this.cmd("Step");
            var mid = Math.floor((low + high) / 2);
            this.doMergeSort(low, mid);
            this.doMergeSort(mid + 1, high);
            this.highlightRange(low, high);
            var insertIndex = low;
            var leftIndex = low;
            var rightIndex = mid + 1;
            while (insertIndex <= high) {
                if (leftIndex <= mid && (rightIndex > high || this.arrayData[leftIndex] <= this.arrayData[rightIndex])) {
                    this.arraySwap[insertIndex] = this.arrayData[leftIndex];
                    this.cmd("Move", this.barObjects[leftIndex], this.barPositionsX[insertIndex], LOWER_ARRAY_Y_POS);
                    this.cmd("Move", this.barLabels[leftIndex], this.barPositionsX[insertIndex], LOWER_ARRAY_LABEL_Y_POS);
                    this.cmd("Step");
                    this.labelsSwap[insertIndex] = this.barLabels[leftIndex];
                    this.objectsSwap[insertIndex] = this.barObjects[leftIndex];
                    insertIndex++;
                    leftIndex++;
                }

                else {
                    this.arraySwap[insertIndex] = this.arrayData[rightIndex];
                    this.cmd("Move", this.barLabels[rightIndex], this.barPositionsX[insertIndex], LOWER_ARRAY_LABEL_Y_POS);
                    this.cmd("Move", this.barObjects[rightIndex], this.barPositionsX[insertIndex], LOWER_ARRAY_Y_POS);
                    this.cmd("Step");
                    this.labelsSwap[insertIndex] = this.barLabels[rightIndex];
                    this.objectsSwap[insertIndex] = this.barObjects[rightIndex];

                    insertIndex++;
                    rightIndex++;
                }
            }
            for (insertIndex = low; insertIndex <= high; insertIndex++) {
                this.barObjects[insertIndex] = this.objectsSwap[insertIndex];
                this.barLabels[insertIndex] = this.labelsSwap[insertIndex];
                this.arrayData[insertIndex] = this.arraySwap[insertIndex];
                this.cmd("Move", this.barObjects[insertIndex], this.barPositionsX[insertIndex], this.array_y_pos);
                this.cmd("Move", this.barLabels[insertIndex], this.barPositionsX[insertIndex], this.array_label_y_pos);
            }
            this.cmd("Step");
        }

        else {
            this.cmd("Step");
        }

    }
    shellSortCallback(event) {
        this.animationManager.clearHistory();

        this.commands = new Array();
        var inc;
        for (inc = Math.floor(this.array_size / 2); inc >= 1; inc = Math.floor(inc / 2)) {
            for (var offset = 0; offset < inc; offset = offset + 1) {
                for (var k = 0; k < this.array_size; k++) {
                    if ((k - offset) % inc == 0) {
                        if (this.obscureObject[k]) {
                            this.obscureObject[k] = false;
                            this.cmd("SetAlpha", this.barObjects[k], 1.0);
                            this.cmd("SetAlpha", this.barLabels[k], 1.0);
                        }

                    }

                    else {
                        if (!this.obscureObject[k]) {
                            this.obscureObject[k] = true;
                            this.cmd("SetAlpha", this.barObjects[k], 0.08);
                            this.cmd("SetAlpha", this.barLabels[k], 0.08);
                        }
                    }
                }
                this.cmd("Step");
                this.insertionSortSkip(inc, offset);

            }

        }
        this.animationManager.StartNewAnimation(this.commands);

    }
    insertionSortSkip(inc, offset) {
        for (var i = inc + offset; i < this.array_size; i = i + inc) {
            var j = i;
            while (j > inc - 1) {
                this.cmd("SetForegroundColor", this.barObjects[j], HIGHLIGHT_BAR_COLOR);
                this.cmd("SetForegroundColor", this.barObjects[j - inc], HIGHLIGHT_BAR_COLOR);
                this.cmd("SetBackgroundColor", this.barObjects[j], HIGHLIGHT_BAR_BACKGROUND_COLOR);
                this.cmd("SetBackgroundColor", this.barObjects[j - inc], HIGHLIGHT_BAR_BACKGROUND_COLOR);
                this.cmd("Step");
                if (this.arrayData[j - inc] <= this.arrayData[j]) {
                    this.cmd("SetForegroundColor", this.barObjects[j], BAR_FOREGROUND_COLOR);
                    this.cmd("SetForegroundColor", this.barObjects[j - inc], BAR_FOREGROUND_COLOR);
                    this.cmd("SetBackgroundColor", this.barObjects[j], BAR_BACKGROUND_COLOR);
                    this.cmd("SetBackgroundColor", this.barObjects[j - inc], BAR_BACKGROUND_COLOR);
                    break;
                }
                this.swap(j, j - inc);
                this.cmd("SetForegroundColor", this.barObjects[j], BAR_FOREGROUND_COLOR);
                this.cmd("SetForegroundColor", this.barObjects[j - inc], BAR_FOREGROUND_COLOR);
                this.cmd("SetBackgroundColor", this.barObjects[j], BAR_BACKGROUND_COLOR);
                this.cmd("SetBackgroundColor", this.barObjects[j - inc], BAR_BACKGROUND_COLOR);
                j = j - inc;
            }

        }
    }
    disableUI(event) {
        this.resetButton.disabled = true;
        this.insertSortButton.disabled = true;
        this.selectSortButton.disabled = true;
        this.bubbleSortButton.disabled = true;
        this.quickSortButton.disabled = true;
        this.mergeSortButton.disabled = true;
        this.shellSortButton.disabled = true;
        this.sizeButton.disabled = true;
    }
    enableUI(event) {
        this.resetButton.disabled = false;
        this.insertSortButton.disabled = false;
        this.selectSortButton.disabled = false;
        this.bubbleSortButton.disabled = false;
        this.quickSortButton.disabled = false;
        this.mergeSortButton.disabled = false;
        this.shellSortButton.disabled = false;
        this.sizeButton.disabled = false;
    }
}


var ARRAY_SIZE_SMALL  = 50;
var ARRAY_WIDTH_SMALL = 17;
var ARRAY_BAR_WIDTH_SMALL = 10;
var ARRAY_INITIAL_X_SMALL = 15;

var ARRAY_Y_POS = 250;
var ARRAY_LABEL_Y_POS = 260;

var LOWER_ARRAY_Y_POS = 500;
var LOWER_ARRAY_LABEL_Y_POS = 510;

var SCALE_FACTOR = 2.0;

var ARRAY_SIZE_LARGE = 200;
var ARRAY_WIDTH_LARGE = 4;
var ARRAY_BAR_WIDTH_LARGE = 2;
var ARRAY_INITIAL_X_LARGE = 15;

var BAR_FOREGROUND_COLOR = "#0000FF";
var BAR_BACKGROUND_COLOR ="#AAAAFF";
var INDEX_COLOR = "#0000FF";
var HIGHLIGHT_BAR_COLOR = "#FF0000";
var HIGHLIGHT_BAR_BACKGROUND_COLOR = "#FFAAAA";

var QUICKSORT_LINE_COLOR = "#FF0000";

